CVE-2026-31598 (GCVE-0-2026-31598)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-24 14:42
VLAI?
Title
ocfs2: fix possible deadlock between unlink and dio_end_io_write
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix possible deadlock between unlink and dio_end_io_write ocfs2_unlink takes orphan dir inode_lock first and then ip_alloc_sem, while in ocfs2_dio_end_io_write, it acquires these locks in reverse order. This creates an ABBA lock ordering violation on lock classes ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE] and ocfs2_file_ip_alloc_sem_key. Lock Chain #0 (orphan dir inode_lock -> ip_alloc_sem): ocfs2_unlink ocfs2_prepare_orphan_dir ocfs2_lookup_lock_orphan_dir inode_lock(orphan_dir_inode) <- lock A __ocfs2_prepare_orphan_dir ocfs2_prepare_dir_for_insert ocfs2_extend_dir ocfs2_expand_inline_dir down_write(&oi->ip_alloc_sem) <- Lock B Lock Chain #1 (ip_alloc_sem -> orphan dir inode_lock): ocfs2_dio_end_io_write down_write(&oi->ip_alloc_sem) <- Lock B ocfs2_del_inode_from_orphan() inode_lock(orphan_dir_inode) <- Lock A Deadlock Scenario: CPU0 (unlink) CPU1 (dio_end_io_write) ------ ------ inode_lock(orphan_dir_inode) down_write(ip_alloc_sem) down_write(ip_alloc_sem) inode_lock(orphan_dir_inode) Since ip_alloc_sem is to protect allocation changes, which is unrelated with operations in ocfs2_del_inode_from_orphan. So move ocfs2_del_inode_from_orphan out of ip_alloc_sem to fix the deadlock.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2b884d52273c60c298bd570163e8053657bbaff6 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bc0fb5c7d54c78be43a536df0e20dee32adb27d3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f9fb1a7b635849322e1d7b7b6b26389778ec8e82 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e049f7a9bd80b7319590789ea5e1c523d6339d91 (git)
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    Linux Linux Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/aops.c"
          ],
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          "vendor": "Linux",
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "6.12.83",
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              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
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                  "versionEndExcluding": "6.19.14",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix possible deadlock between unlink and dio_end_io_write\n\nocfs2_unlink takes orphan dir inode_lock first and then ip_alloc_sem,\nwhile in ocfs2_dio_end_io_write, it acquires these locks in reverse order.\nThis creates an ABBA lock ordering violation on lock classes\nocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE] and\nocfs2_file_ip_alloc_sem_key.\n\nLock Chain #0 (orphan dir inode_lock -\u003e ip_alloc_sem):\nocfs2_unlink\n  ocfs2_prepare_orphan_dir\n    ocfs2_lookup_lock_orphan_dir\n      inode_lock(orphan_dir_inode) \u003c- lock A\n    __ocfs2_prepare_orphan_dir\n      ocfs2_prepare_dir_for_insert\n        ocfs2_extend_dir\n\t  ocfs2_expand_inline_dir\n\t    down_write(\u0026oi-\u003eip_alloc_sem) \u003c- Lock B\n\nLock Chain #1 (ip_alloc_sem -\u003e orphan dir inode_lock):\nocfs2_dio_end_io_write\n  down_write(\u0026oi-\u003eip_alloc_sem) \u003c- Lock B\n  ocfs2_del_inode_from_orphan()\n    inode_lock(orphan_dir_inode) \u003c- Lock A\n\nDeadlock Scenario:\n  CPU0 (unlink)                     CPU1 (dio_end_io_write)\n  ------                            ------\n  inode_lock(orphan_dir_inode)\n                                    down_write(ip_alloc_sem)\n  down_write(ip_alloc_sem)\n                                    inode_lock(orphan_dir_inode)\n\nSince ip_alloc_sem is to protect allocation changes, which is unrelated\nwith operations in ocfs2_del_inode_from_orphan.  So move\nocfs2_del_inode_from_orphan out of ip_alloc_sem to fix the deadlock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:42:23.304Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6"
        },
        {
          "url": "https://git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82"
        },
        {
          "url": "https://git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91"
        }
      ],
      "title": "ocfs2: fix possible deadlock between unlink and dio_end_io_write",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31598",
    "datePublished": "2026-04-24T14:42:23.304Z",
    "dateReserved": "2026-03-09T15:48:24.121Z",
    "dateUpdated": "2026-04-24T14:42:23.304Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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      "date": "2026-04-25",
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      "percentile": "0.04621"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31598\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:37.560\",\"lastModified\":\"2026-04-24T17:51:40.810\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: fix possible deadlock between unlink and dio_end_io_write\\n\\nocfs2_unlink takes orphan dir inode_lock first and then ip_alloc_sem,\\nwhile in ocfs2_dio_end_io_write, it acquires these locks in reverse order.\\nThis creates an ABBA lock ordering violation on lock classes\\nocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE] and\\nocfs2_file_ip_alloc_sem_key.\\n\\nLock Chain #0 (orphan dir inode_lock -\u003e ip_alloc_sem):\\nocfs2_unlink\\n  ocfs2_prepare_orphan_dir\\n    ocfs2_lookup_lock_orphan_dir\\n      inode_lock(orphan_dir_inode) \u003c- lock A\\n    __ocfs2_prepare_orphan_dir\\n      ocfs2_prepare_dir_for_insert\\n        ocfs2_extend_dir\\n\\t  ocfs2_expand_inline_dir\\n\\t    down_write(\u0026oi-\u003eip_alloc_sem) \u003c- Lock B\\n\\nLock Chain #1 (ip_alloc_sem -\u003e orphan dir inode_lock):\\nocfs2_dio_end_io_write\\n  down_write(\u0026oi-\u003eip_alloc_sem) \u003c- Lock B\\n  ocfs2_del_inode_from_orphan()\\n    inode_lock(orphan_dir_inode) \u003c- Lock A\\n\\nDeadlock Scenario:\\n  CPU0 (unlink)                     CPU1 (dio_end_io_write)\\n  ------                            ------\\n  inode_lock(orphan_dir_inode)\\n                                    down_write(ip_alloc_sem)\\n  down_write(ip_alloc_sem)\\n                                    inode_lock(orphan_dir_inode)\\n\\nSince ip_alloc_sem is to protect allocation changes, which is unrelated\\nwith operations in ocfs2_del_inode_from_orphan.  So move\\nocfs2_del_inode_from_orphan out of ip_alloc_sem to fix the deadlock.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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